/* Copyright  (c) 2002 Graz University of Technology. All rights reserved.
 *
 * Redistribution and use in  source and binary forms, with or without 
 * modification, are permitted  provided that the following conditions are met:
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 * 1. Redistributions of  source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in  binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include the following acknowledgment:
 * 
 *    "This product includes software developed by IAIK of Graz University of
 *     Technology."
 * 
 *    Alternately, this acknowledgment may appear in the software itself, if 
 *    and wherever such third-party acknowledgments normally appear.
 *  
 * 4. The names "Graz University of Technology" and "IAIK of Graz University of
 *    Technology" must not be used to endorse or promote products derived from 
 *    this software without prior written permission.
 *  
 * 5. Products derived from this software may not be called 
 *    "IAIK PKCS Wrapper", nor may "IAIK" appear in their name, without prior 
 *    written permission of Graz University of Technology.
 *  
 *  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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 *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE LICENSOR BE
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 *  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY  OF SUCH DAMAGE.
 */
 
package iaik.pkcs.pkcs11;

import iaik.pkcs.pkcs11.wrapper.Constants;



/**
 * This class is a simeple implementation of InitializeArgs.
 *
 * @author <a href="mailto:Karl.Scheibelhofer@iaik.at"> Karl Scheibelhofer </a>
 * @version 1.0
 * @invariants
 */
public class DefaultInitializeArgs implements InitializeArgs {

  /**
   * The mutex-handler of this object.
   */
  protected MutexHandler mutexHandler_;

  /**
   * Indicates that application threads which are executing calls to the
   * library may not use native operating system calls to spawn new threads.
   */
  protected boolean libraryCantCreateOsThreads_;

  /**
   * Indicates that the libary may use mechanisms of the operating-system
   * to do thread-locking.
   */
  protected boolean osLockingOk_;
  
  /**
   * The reserved parameter in the initialization arguments.
   */
  protected Object reserved_; 

  /**
   * Default constructor.
   *
   * @preconditions
   * @postconditions (mutexHandler_ == null)
   *                 and (libraryCantCreateOsThreads_ == false)
   *                 and (osLockingOk_ == true)
   */
  public DefaultInitializeArgs() {
    mutexHandler_ = null;
    libraryCantCreateOsThreads_ = false;
    osLockingOk_ = true;
    reserved_ = null;
  }

  /**
   * Constructor, taking a mutex-handler, the libraryCantCreateOsThreads flag
   * and the osLockingOk flag.
   *
   * @param mutexHandler The PKCS#11 module should use this mutex-handler.
   * @param libraryCantCreateOsThreads Indicates that application threads which
   *                                   are executing calls to the library may
   *                                   not use native operating system calls to
   *                                   spawn new threads .
   * @param osLockingOk Indicates that the libary may use mechanisms of the
   *                    operating-system to do thread-locking.
   * @preconditions
   * @postconditions (mutexHandler_ == mutexHandler)
   *                 and (libraryCantCreateOsThreads_ == libraryCantCreateOsThreads)
   *                 and (osLockingOk_ == osLockingOk)
   */
  public DefaultInitializeArgs(MutexHandler mutexHandler, boolean libraryCantCreateOsThreads,
                               boolean osLockingOk)
  {
    mutexHandler_ = mutexHandler;
    libraryCantCreateOsThreads_ = libraryCantCreateOsThreads;
    osLockingOk_ = osLockingOk;
    reserved_ = null;
  }

  /**
   * This method returns the object that implements the functionality for
   * handling mutexes. It returns null, if no handler is set. If this method
   * returns null, the wrapper does not pass any callback functions to the
   * underlying module; i.e. is passes null-pointer for the functions.
   *
   * @return The handler object for mutex functionality, or null, if there is
   *         no handler for mutexes.
   * @preconditions
   * @postconditions (result == mutexHandler_)
   */
  public MutexHandler getMutexHandler() {
    return mutexHandler_ ;
  }

  /**
   * Check, if application threads which are executing calls to the library may
   * not use native operating system calls to spawn new threads.
   *
   * @return True, if application threads which are executing calls to the
   *         library may not use native operating system calls to spawn new
   *         threads. False, if they may.
   * @preconditions
   * @postconditions (result == libraryCantCreateOsThreads_)
   */
  public boolean isLibraryCantCreateOsThreads() {
    return libraryCantCreateOsThreads_ ;
  }

  /**
   * Check, if the library can use the native operation system threading model
   * for locking.
   *
   * @return True, if the library can use the native operation system threading
   *         model for locking. Fasle, otherwise.
   * @preconditions
   * @postconditions (result == osLockingOk_)
   */
  public boolean isOsLockingOk() {
    return osLockingOk_ ;
  }

  /**
   * Reserved parameter.
   *
   * @return Should be null in this version.
   * @preconditions
   * @postconditions
   */
  public Object getReserved() {
    return reserved_ ;
  }

  /**
   * This method sets the object that implements the functionality for
   * handling mutexes. It should be null to set no handler.
   *
   * @param mutexHandler The handler object for mutex functionality, or null
   *                     to use no handler.
   * @preconditions
   * @postconditions (mutexHandler_ = mutexHandler)
   */
  public void setMutexHandler(MutexHandler mutexHandler) {
    mutexHandler_ = mutexHandler;
  }

  /**
   * Set, if application threads which are executing calls to the library may
   * not use native operating system calls to spawn new threads.
   *
   * @param libraryCantCreateOsThreads True, if application threads which are
   *                                   executing calls to the library may not
   *                                   use native operating system calls to
   *                                   spawn new threads. False, if they may.
   * @preconditions
   * @postconditions (libraryCantCreateOsThreads_ == libraryCantCreateOsThreads)
   */
  public void setLibraryCantCreateOsThreads(boolean libraryCantCreateOsThreads) {
    libraryCantCreateOsThreads_ = libraryCantCreateOsThreads;
  }

  /**
   * set, if the library can use the native operation system threading model
   * for locking.
   *
   * @param osLockingOk True, if the library can use the native operation system
   *                    threading model for locking. Fasle, otherwise.
   * @preconditions
   * @postconditions (osLockingOk_ == osLockingOk)
   */
  public void setOsLockingOk(boolean osLockingOk) {
    osLockingOk_ = osLockingOk;
  }

  /**
   * Set the reserved parameter.
   *
   * @param reserved Should be null in this version.
   * @preconditions
   * @postconditions
   */
  public void setReserved(Object reserved) {
    reserved_ = reserved;
  }

  /**
   * Returns the string representation of this object.
   *
   * @return The string representation of object
   */
  public String toString() {
    StringBuffer buffer = new StringBuffer();

    buffer.append("Mutex Handler: ");
    buffer.append((mutexHandler_ != null) ? "present" : "not present");
    buffer.append(Constants.NEWLINE);

    buffer.append("Library can't create OS-Threads: ");
    buffer.append(libraryCantCreateOsThreads_);
    buffer.append(Constants.NEWLINE);

    buffer.append("OS-Locking OK: ");
    buffer.append(osLockingOk_);
    buffer.append(Constants.NEWLINE);

    buffer.append("The reserved parameter is: ");
    buffer.append((reserved_ != null) ? reserved_.toString() : "null");

    return buffer.toString() ;
  }

}
